Ok, I found something that works.
http://www.wisdom-soft.com/downloads/downloadfiles.htmScroll down to "Free Programs" and get "AutoScreenRecorder 3".
Set it to record as divx. There's no bitrate setting so open virtualdub and go as if you're going to encode a video and set the divx setting in there then close vdub and Screen Recorder will use that bitrate.
When you start to record you have to drag your mouse to select which part of the screen to record.
Click the "HANGRY&ANGRY @Chibi Japan Expo Episode 2" link on this page:
http://blogs.myspace.com/index.cfm?fuseaction=blog.view&friendId=1004191790&blogId=519222905to open it up on a new page because it's 640x360. I can't put the link here because it just auto-embeds in the small size.
Drag your mouse carefully and select the area to record, on that page the video plays at 640x360 which is perfect, make sure you get that exact size or it'll be nonstandard and probably won't play on some players. It starts playing too soon before you're ready so once you've got the window the right size restart the vid from the beginning then chop the excess off afterwards with vdub.
Someone else has to record it though. I've done the groundwork and it works but frame rate was poor because my processor isn't good enough.